Add ability to pass additionnal models to Func for formatting

[christophehenry]

Add an optionnal 'additionnal_models' attribute to Func allowing to specify additionnal models to pass to formatting function. Useful for SQL queries that involve multiple tables.

Type: feature

[christophehenry]

Can I have a feedback here? I think this is ready for a merge.

[wesleykendall]

Thanks for your suggestion. I'm thinking that this may be too specific of a context variable at the moment to go in the main library. There have been a few requests for extending Func, and I think I'd like to just support Django's template rendering system and either a) pass in all model metadata as a var or b) have a template tag.

In any case, for now you should still be able to subclass Func and use this change in your project. I will open a discussion about better template rendering and if this belongs in the library or in a third-party extension

[christophehenry]

Awesome!